Improvement in saws



uniud am y sample.

f CHARLES MITZELEELD, or DETRoHfMIcHIeAN, Assicnon'ro HIMSELF AND MARK r-LANIGAN, or SAME PLACE. y

Letters Patent No. 106,187, dated August 9, 187 0;

The Schedule referred to in these Letters Patent and making partie! the same.

v To whom it may concern.-

and clearingfteet-h.

with the face of said plate.'

Be it known that I, CHARLES MI'rzELFELD, of

i Detroit, in the county of- Wayne'andState of Michigan, have invented a new and useful Improvement in Circular Cfiosslcut and Splitting Saws and I do de# claro that the following is atruetandlaccnrate descrip'- tion thereof, reference being had to the'accompanying drawing and to the yletterset' reference marked there-` .on, and heilig a partof this specification.

The nature ofthis invention relates'to au improvement in circular saws, so constructing them that they will operate equally well in splitting as in cross-outtiug, thattheywill clear themselves under all circnmstances, and that they will leave the lumber as smooth as though the; same' had been planed olf.

` lhe invention consists in giving to t-heV sides of the teeth a chisel-shaped ledge, as well as the edge, said `teeth being beveled or made chisel-shaped on the two y dreior arbor upon whichit rotates.

liis a series of saw-teeth, gummed, cut,'fiJed,'or otherwise made in the periphery ofY said plate.

The backs b of the teeth are upon the same plane `The opposite' sides ofr these teeth,- lettered c, are beveled or made chisel-shaped on both edges, from the base d,` to the top e, and alsoacross the top from c to 4e, or, Vin other words, the form is that of a tooth having two rectangular corners, flat on its rear side, and

sharpened upon ,each of its edges on the front side,

and arranged so that alternating teeth are out upon alternate sides. ,i I

C are clearing-teeth, preferably a trifle short-er than the cuttingfteeth. They are ot' the same thickness` as they saw-blade, and theirvtops terminate in fingers lor spurs 71,1carried up cfa-uniform thickness. A sut? `ticient number-.of these teeth is employed to effect-` nail y clear all sawdust or cuttings yfrom the saw-kerf.

'lhe cutting-teeth B may be set7 alike, it' deemed desirable, although'not necessaryfto their successful working. The spaces between the teeth are about equal to the width of onef of the teeth. l -I am aware that saws are now in nseprovided with chisel-.shaped teeth at their points, which are e1nplo'yed for cross-cutting. The only objection to them for that purpose is that they choke, there being lno way provided for clearing out the sawdust or cuttings.

-These ysaws are entirely useless for slitting Vor splitting purposes, where the cutting is done inthe direction ot' the fiber of A the wood.

vThe givingftheteeth a prism-atie form, or beveling thV edges aswell asl they top to a chisel cutting-edge,

*enables this saw to work equally `as wellin splitting asin cross-cut sawing, the edges forming planes which finish the cut upon both sides as smoothly as though the surfaces of-,the lumber had been planed oi" in a supplementary finishing, while the clearing-teeth l'- fectually throw outfall dust or cuttings. p I therefore do not claim a sawwith a tooth made chiselfshaped at its end; but

VVhat I do claim as my invention, and desire to sef cure by Letters Patent, isf Y d. The teeth B, constructed as described and shown,

and as and ihr the purposes set forth. y

2. In circular saws, the combination ofthe cuttingteeth B and clearing-teeth O, when constructed in the form,jand operating substantially as and for the purposes herein set forth, shown,'and specified.

- CHARLES MITZELFELD.

Witnesses:

SAM. J. SPRAY, FREDnRlcK EBnR'rs. 

